I installed Norton Anitviru 2004/ after installing I could not send or receive e-mails in Microsoft Outlook. I would get this error message: Sending & receiving reproted error (0X800CC0F). The connection to the server was inerrupted. If the probem continues contact your server admin. or Internet Service Provider. I contacted my provider but said they couldn't advise because it was Outlook........ I then uninstalled Norton (which I didn't want to do for security reasons) and now my e-mail is OK......I did go into Tools in my e-mail then e-mail accts/view or change/ did name and type removed and then same process and added but still the same problem when Norton was installed. I'm sure I need to tweak something but I'm not that knowlegable in that department and need guidance......any help would be appreciated